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Thermador Dishwasher E15 Error Code: AquaStop Water Protection Activated

Quick Answer

The E15 code on a Thermador dishwasher means the AquaStop flood protection system has activated because water leaked into the base pan. The float switch in the base detects standing water and immediately locks the machine. You cannot clear E15 by pressing any button - the base pan must be physically drained by tilting the machine 45 degrees forward, then you must find and fix the leak source.

The E15 code on a Thermador dishwasher means the AquaStop flood protection system has activated because water leaked into the base pan. The float switch in the base detects standing water and immediately locks the machine. You cannot clear E15 by pressing any button - the base pan must be physically drained by tilting the machine 45 degrees forward, then you must find and fix the leak source. Common leak points are the door seal, detergent dispenser seal, pump seal, and fill hose connection. After draining and repairing the leak, plug the machine back in and it will restart normally.

ThermadorDishwasherSeverity: criticalDifficulty: intermediate70% DIY Success
Time to Fix
15–120 min
Difficulty
intermediate
Parts Cost
$12 – $35
Tools Needed
Multimeter (for float switch continuity test), Towels for base pan drainage
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Not seeing E15 on your display?

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AquaStop flood protection activated
BoschE15

What Does the E15 Code Mean?

Water has collected in the base pan, tripping the AquaStop float switch. You must drain the base and fix the source of the leak before E15 will clear.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Worn or cracked door gasket allowing water to drip into base40%
Leaking detergent dispenser seal24%
Failed pump seal causing water to escape into base14%
Cracked sump housing (rare)12%
Loose or cracked fill hose connection at the water inlet10%

Symptoms You May Notice

  • E15 displayed on control panel
  • Machine stops mid-cycle and will not restart
  • All indicator lights may flash
  • Machine will not respond to any button input
  • Possible visible water pooling under the dishwasher

Can you reset a Thermador dishwasher to clear the E15 code?

E15 cannot be cleared by pressing any button combination. You must physically drain the base pan by unplugging and tilting the machine 45 degrees forward. Once the base pan is dry and the leak is repaired, plug the machine back in. E15 will clear automatically. If E15 reappears immediately after restart, the leak has not been fixed.

Tools Required for Diagnosis

Multimeter (for float switch continuity test)Towels for base pan drainageFlashlight for leak inspectionScrewdriver to remove kick plate

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Unplug the dishwasher from the wall outlet

Unplug the dishwasher from the wall outlet. Open the door and check the door gasket visually for cracks, tears, or sections that have pulled away from the channel.

2

Carefully tilt the dishwasher 45 degrees forward (toward you) to

3

With the machine upright again, remove the lower kick plate panel

4

To test the float switch itself

5

After repairs, make sure the base pan is completely dry

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Door gasket / door seal11016727 · $18–$35
Base tray float switch00187197 · $12–$25

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $24 (Parts) vs $1800 (New Machine)

Frequently Asked Questions

Can I reset Thermador E15 by unplugging the dishwasher?
No. Unplugging does not clear E15 because the float switch in the base pan is still in the raised (triggered) position. You must physically drain the base pan by tilting the machine 45 degrees forward. Once the float drops back down, the machine will reset when powered back on.
How do I drain the base pan on a Thermador dishwasher?
Unplug the machine first. Place towels on the floor in front of it. Carefully pull the dishwasher forward slightly (if built-in) then tilt it toward you at about 45 degrees and hold for 30-60 seconds. The water in the base pan will run out through the front. Some water may spill, so have towels ready.
How do I find the leak causing E15?
Common sources are the door gasket (visible cracks or stiff sections), the detergent dispenser seal, the pump seal (accessible from below after removing the kick plate), and the fill hose connection at the back. Run a short cycle after reattaching the kick plate and watch from below with a flashlight to catch where dripping originates.
Is the Thermador E15 the same as Bosch E15?
Yes. Both brands are made by BSH Group and use the same AquaStop system, the same float switch design, and the same E15 code. The repair procedure is identical.
The E15 keeps coming back after I drained the base pan. What now?
A recurring E15 means the leak is still present and water is re-entering the base pan during operation. You need to identify and repair the leak source before the problem will stay resolved. Check the door seal under compression, the pump seal, and all hose connections.

Related Thermador Dishwasher Error Codes

Code: HUBThermador Dishwasher Error Codes: Complete List for DWHD and Sapphire SeriesCode: E24Thermador Dishwasher E24 Error Code: Drain FaultCode: RESETHow to Reset a Thermador Dishwasher and Clear Error Codes

Same Fix on Other Brands

Bosch dishwasherE15: Bosch Dishwasher E15 Error Code

Same Fix Works on These Brands

Thermador shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

Bosch dishwasherBosch Dishwasher E15: Fix the Anti-Flood Alert FastBosch dishwasherBosch Dishwasher Error Codes: Complete List + FixesBosch dishwasherHow to Reset a Bosch Dishwasher (Every Method)Bosch dishwasherBosch E24 Error: Drain Problem Solved Step by StepBosch dishwasherBosch E25 Code: Drain Pump Fix Without a TechnicianBosch dishwasherBosch Dishwasher Not Draining: Every Cause Covered

Models Known to Experience E15 Errors

This repair applies to most Thermador dishwashers with this error code. Common model numbers include:

DWHD440MFP, DWHD640JFP, DWHD640ZFP, DWHD660ZFP, DWHD771WFP

Last verified for technical accuracy on March 14, 2026